Spring bed-bottom



M A THRONE "Spring BedBottom.

No. 229,020. Patentdjufie 22,1880.

Fiyl,

Figs

2 2X KKK lNV ENTO R /WITN ESSES N.FE|'ERS. FHOTO-LJ'IHOGRAPHER, WASHINGTON. D. C.

UNITED STATES MICHAEL THRONE, OF CHICAGO, ILLINOIS.

SPRING BED-BOTTOM.

SPECIFICATION formingpart of Letters Patent No. 229,020, dated June 22, 1880. Application filed February 24, 1880.

To all whom it may concern:

Be it known that'I, MICHAEL A. THRONE, of Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Spring Bed-Bottoms; and I hereby declare the following to be a full, clear, and exact description thereof, which will enable others skilled in the art to which my invention appertains to make and use the same, reference being bad to the accompanying drawings, forming a part hereof, and in which- Figure 1 represents the box or corner piece connecting the end bar to the side bar. Fig.

d 2 represents a side elevation, and Fig. 3 a plan view, of a spring bed-bottom embodying my invention.

Like letters of reference indicate like parts.

My invention relates more particularly to that class of bed-bottoms known as wovenwire mattresses, in which the wire fabric is attached to the end bars and extends along the entire length, and is suspended over the outer edge of the side rails.

I construct my improved bed-bottom as shown in the accompanying drawings, in which A represents the wooden side bars, to which are attached the end bars, B and B, and to said end bars is attached the woven wire mattress or fabric D in any suitable manner.

One of the end bars, B, is rigidly attached or bolted to the side bars, and the other end bar, B, is adj ustably attached to said side bars by means of sliding boxes or corner-pieces O, which are firmly attached to the ends of the end bar, B and so made as to slide freely upon the side bars, A, for the purpose of adjusting the tension of the fabric D, and which is regulated by means of the serrated eccentric or cam levers a, which are pivoted to the side bars and bear against the inner edge of the upper side of the corner-piece 0, so that by turning said cam-levers on their fulcrums the end bar, B, is pushed from B, the stationary end bar, thereby stretching the fabric D from end to end.

Upon about the middle half of the side bars, A, are placed a series of. coiled springs, 12, which are united together by hooks l, and by hooks c to the edge of the fabric D.

Through the upper coil of said springs D is passed a thin strap or band of flexible metal, 11, so as to cause the upper and inner edge of the coil to bear against the edge of the strap d. One end of the strap (1 is firmly attached to the end rail, B, and the other end is adjustably attached to the end rail, B, by means of a slot, 0, through which a set-screw, f, passes into the end rail, B, for the purpose of adjusting it to the movements of the bar B when adjusting it for the strain of the fabric D.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a spring bed-bottom, the combination of the adjustable end rail attached to the woven-wire fabric D, adjustable strap (1, coiled spring I), attached to the adjustable strap 01 and woven-wire fabric D, and side rails, A, substantially as shown and described.

2. In a spring bed-bottom, the combination, with the side rails, A, end rails, B B, and fabric D, attached to and suspended from the end rails, of the slidingboxes or corner-pieces O and cam-levers a, substantially as shown and described.

MICHAEL A. THRONE. 

